Lapping help?

I’m having issues using the Star looper and the Viper one coaster models in the game due to the lapping. I cannot make a complete coaster due to the carts always going and cant make it a normal functioning coaster. I was wondering if there was a possible way to turn off the lapping or if there isnt, when the coasters will be able to complete a full circut like most of the coasters in the game? Thanks